melissa mollet is live at the scene. good morning. >> reporter: good morning to you. officers still on the scene two hours later taking photos, taking measurements. this all started around 2:15 this morning. an arlington police officer was responding to a call at the boston mall of a fight, as you said. he was heading down washington boulevard when somehow his vehicle collided with that tan corolla you see there at the median. that corolla ended up on the median. the police cruiser, if you look on the right, ended up on the side of the road in the bushes pretty well damaged in the front. we understand from investigators out on the scene, it was a female driving that corolla. she suffered minor injuries. the officer did suffer serious injuries and was transported to the hospital. of course, this intersection is going to be closed here for some time. if you're heading out in this direction any time this morning, you do want to avoid this area because, again, it will be shut down as this investigation continues. as soon as we get more information, we, of course, will pass that information along.